Remove CDN fallback logic (v2)

src/installer.ts

@@ -262,12 +262,8 @@ export class DotnetCoreInstaller {
     httpClient: hc.HttpClient,
     versionParts: string[]
   ): Promise<string> {
-    let response;
-    try {
-      response = await httpClient.getJson<any>(DotNetCoreIndexUrl);
-    } catch (error) {
-      response = await httpClient.getJson<any>(DotnetCoreIndexFallbackUrl);
-    }
+    const response = await httpClient.getJson<any>(DotNetCoreIndexUrl);
+
     const result = response.result || {};
     let releasesInfo: any[] = result['releases-index'];
 
@@ -307,6 +303,3 @@ export class DotnetCoreInstaller {
 
 const DotNetCoreIndexUrl: string =
   'https://builds.dotnet.microsoft.com/dotnet/release-metadata/releases-index.json';
-
-const DotnetCoreIndexFallbackUrl: string =
-  'https://dotnetcli.blob.core.windows.net/dotnet/release-metadata/releases-index.json';